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(No Model.)

J. W. FULLER.

TELBGRAPH RECEIVING APPARATUS. No. 249,920. Patented Nov. 22,1881.

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Uren STATES PATENT Ori-rca JOHN WTULLER, F LONDON, ENGLAND.

TELEGRAPH RECEIVING APPARATUS'.

SPEC'IFICATIION forming part of Letters Patent. No. 249,920, dated November 22, 1881.

Application lcd July 26, 1881. (No model.) Iatentcd in England November F, i880.

To all whom yit may concern Beit known that I, JOHN WILLIAM FULLER, asubjectot'the Queen of GreatBritain, residing at 52 Old Broad Street, in the city of London, England, have invented certain new and useful Improvements in Telegraph Receiving Apparatus, (for which I have received Letters Patent in England, No. 4,581, dated 8th .Novem ber, 1880,) ot' which the following is a specitication.

Theobjectofmy invention isto obtain through long submarine telegraph-cables upon a moditied form of mirror or reflecting galvanometer, first, an enlargement or clearer definition of signals, and at the same time, second, more rapid and distinct readable telegraph-signals than can be received upon that instrument in its present form or forms of construction; and, third, a more advantageous working speed through longerlengths of submarine telegraphcable than can now be done.

To effect the above improvement I construct the bobbin on which the galvanometer-coils are Wound ofpeculiar shape, the opening or passage throughout its center'heing of various dimensions, diminishing as it approaches the part to be occupied by the mirror. The consequence is that the conducting-Wire, when wound upon it, is at different distances from the center, according to the position in which it surrounds the before-mentioned opening. The wire wound on the bobbin is in several sections or separate coils, and arrangement is made for shunting the outer coils when they are not required. At the end of the said central opening or passage in the bobbin I insert a special contrivance for holding the suspended mirror, consisting ot" a semi-funnel-shaped tube or cup, and made so as to suitwhatever range of reected light may be required upon the scale. l prefer this contrivance to lit in from the front-z'. e., in that side of the opening facing the scale. At the other end ofthe aforesaid opening I insert, as a sort of core, Within the bobbin one of the following appliances: a, a special form of magnet consisting of two straight rods joined across at the outer end; b, a double helical or Morse-armature-shaped coil joined as the [nagnet just described; c, a bundle of iron wires shaped to the varying size ofthe opening above mentioned; d, a bundle of iron wires surrounded by a coil ot' wire, shaped and incased for fitting within the opening aforesaid; e, a solid block of iron shaped to the varying size of the aforesaid opening; j', a solid block of iron surrounded by a coll ot' Wire. Each of the appliances described is so constructed that it can be connected with a battery-condenser, or like electrical apparatus. I

In order that my said invention may be most fully understood and readily carried into effect, I will proceed to describe the drawings hereunto annexed.

Figure lis a transverse section ofthe bobbin and coils ot' my receiving-instrument. It is woundin foursections,c,b,c,and d,butthenum ber may he either less or more. The front coilsection has an opening'in the center ofa size only sufficient to recci ve the holder in which the suspended mirror and magnet are contained. This holder is shown by the Fig. 2. The mirror and magnet, being arranged in the holder in the usual manner` are not shown. The part ofthe holder in which the mirror and magnet are held suspended is of cylindrical form, and from this two Wings project obliquely to the front, giving to the holder a semi-funnel-like form. These wings, which from their Obliquity do Ilot obscure the light from the mirror While it moves through a sufficiently large angle, render iteasy to change the suspended magnetand mirror at any time when it may become desirable. The holder being taken holdof byits wings can be drawn out from its place in the center of the part a of the coils and put back in an instant. The section b ofthe coils immediately behind the section a has an aperture through it larger than the aperture in the coil (t, and in the sections c and d the apertures are again and again larger. Thus there is a coniform cavity within the series of coils, and in this cavityl arrange adjusting appliances. mx represents the ordinary directing-magnet above.

The following arrangementis madefor shunting theoutercoils when notrequired. The coils are wound continuously in one direction from the commencement ofthe section ct to the nish of the section d, and the ends are brought down to the blocks@ and f, which are insulated by being fixed upon a vulcanite mounting carried on the foot of the instrument, and shown in plan at Fig. 3. The same mounting sup- IOCI ports other insulated metal blocks, g, h, and

A wire from the block g passes to the coilwire at a point between the sections c and d of the coil, and the insertion of a metal peg into the socket, provided for the purpose between the blocksfand g, has the eiect of shunting the back section, r1, of the coil. Similarly the block h is connected with the coil-wire between the sections b and c, and the insertion ofa metal peg into the socket betweenf and h has the eifcct of shunting the section c of the coil. Likewise the section bis shuuted by the insertion of a peg into the socket betweenf and i, and the insertion of a peg between e and fshunts all the coils and puts the instrument out of use.

Fig. 4 shows, again, a transverse section of the coils of the instrument, and with it one of the adjusting appliances which I provide. Appliance a consists of two straight magnetic rods, k and l,joined across the north pole ofone to the south pole ofthe other by the iron connecting-piece m. There are sockets on the connecting-piece, through which the magnetic rods k and l can slide. In making the adjustment these rods can be independently pushed inward and drawn outward with the fingers. They can also be moved together nearer to or farther from the suspended mirror, for they are carried in a holder, n, which is coupled by the pin o with the slide p. This slide has a -screw cut upon its stem, which passesthrough the thumb-nut p', and by turning this nut the slide p is moved to or from the coils, carrying the adjusting appliance with it.

Fig. 5 shows a section of the coils with my adjusting appliance b. This is a double helical armature. The two bobbins of insulated Wire g q surround iron cores, which are furnished with the pole-pieces q q'. -The ends of the wire are brought out to the metal terminals q q2, by which connection with a battery or with a condenser may be made. This adjusting appliance is mounted in a holder, n, similar to that represented in Figs. land 4, and by removing the coupling-pin o one appliance can be drawn out and the other can then be put in its place.

Fig. 6 shows a section of the coils, together with my adjusting appliance c. This consists of a bundle or mass of iron wires, r, closely compacted together, and of a form to enter and fill the free aperture within the coils of the instrument. 1t is contained in a brass holder, r', and, like my other adjusting appliances, it is, when in use, connected with the slidep by the coupling-pin o, and the adjustment is made by moving it inward or outward by turning the nut p.

My adjustment d, l do not show by my drawings, as it is in all respects similar to my adjustmeut f, hereinafter more fully described, except only that a bundle of iron wires compacted together, asin the adjustment c, takes the place ofthe solid mass of iron to be found in the adjustmentf.

Fig. 7 shows a section of the coils, together with my adjustmente. This consists simply of a mass ot' iron, s, of a form to enter and ll the free aperture within the coils of the instrument, and which is accurately set to the position in which the instrument is found to Work best by means of the slide and nntp and p.

Fig. S shows a section of the coils, together with my adjustmentf. This adjustment differs from the adjustmente,in that the iron block s is provided with circumferential grooves in which the coils of insulated wire t are lodged. The wire is wound all in one direction, and the ends are brought out to metal terminals q q2, as described in respect to the appliance b, so that the ends can at pleasure be connected together, or with a battery or condenser.

In the adjustment of the instrument to work upon any long-cable circuit with which it may be required to operate, I make trial of these adiusting appliances in succession under the conditions and in the manner described, and Iretain in use that arrangement which I thus [ind to best suit the special case.

This invention will enable a smaller core to be used in long ocean-cables than at present.

Having thus described the nature of my said invention and the manner of performing the same, I would have it understood thatIclaim- 1. The galvanometer-coils formed, substantially as described, with a coniform aperture in the center of the coils increasing in diameter in receding from the plane in which the mirror and magnet are suspended.

2. The mirror and magnet holder consisting of a cylindrical body havin gobliquely-projecting wings, substantially as described.

3. The adjusting appliance consisting of the combination ot' the two magnets, the iron connecting-piece having sockets through which the magnets slide, the holder, the couplingpin, the slide, and the thumb-screw.

4. The combination, substantially as herein described, of the conically-wound coils, the mirror-holder having a cylindrical-shaped body with obliquely-projecting wings, and the adjusting apparatus consisting of two magnets, the holder, the iron connecting-piece through which the magnets slide, the coupling-pin, the slide, and the thumb-screw.

J. W. FULLER.

Witnesses:

JOHN DEAN, J. WATT,

Both of 17 Gracechurch Street, London.

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